Hi i need to differentiate the following function:

f(x) = e^x . (x+2) . (x-1)

I know the answer is

f'(x) = e^x (x^2 + 3x -1)

But have no idea how to get to this! Any help please?

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- Dec 16th 2009, 12:19 PMxxJaRxxDifferentiation
Hi i need to differentiate the following function:

f(x) = e^x . (x+2) . (x-1)

I know the answer is

f'(x) = e^x (x^2 + 3x -1)

But have no idea how to get to this! Any help please? - Dec 16th 2009, 12:30 PMxxJaRxx
Plus then i need to make f'(x) = 0 and find that x = -3.30 and x = 0.30 :\

- Dec 16th 2009, 12:44 PMadkinsjr
I think the function looks like this:

If I'm correct, then the derivative is where . This is the chain rule.

It's difficult to read what you typed. You should try to use the latex. - Dec 16th 2009, 12:49 PMxxJaRxx
No sorry the question is

f(x) = (e^x) . (x+2) . (x-1)

and answer is

f'(x) = (e^x) (x^2 + 3x -1) - Dec 16th 2009, 01:04 PMpickslides
If the equation is

Then - Dec 16th 2009, 02:15 PMxxJaRxx
Thanks for everyones help ive got it sorted now!

Need help with this now!

Whats the derivative of:

Sin ( (x^2) + x ) - Dec 16th 2009, 02:20 PMpickslides
Lets say

and

Now - Dec 16th 2009, 02:25 PMxxJaRxx
so the answer is..

(2x + 1) . cos( (x^2) + x )

Is that right? - Dec 16th 2009, 03:10 PMxxJaRxx
Okay so i swear the answer to this question is wrong!

Bit of integration instead of differentiation! :p

and the answer is

Whereas I would have said it was

Any help? - Dec 16th 2009, 04:15 PMpickslides
- Dec 16th 2009, 04:20 PMpickslides
Read this Integration by parts - Wikipedia, the free encyclopedia

For

In your case make and

now find and